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QBVW033A0B1-HZ Datasheet(PDF) 9 Page - Lineage Power Corporation |
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QBVW033A0B1-HZ Datasheet(HTML) 9 Page - Lineage Power Corporation |
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9 / 18 page  Data Sheet September 23, 2011 QBVW033A0B Series Power Modules; DC-DC Converters 36-75Vdc Input; 12Vdc Output; 33A Output Current LINEAGE POWER 9 Feature Descriptions (continued) Remote Sense (“9” Option Code) Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections (See Figure 15). The SENSE(-) pin should be always connected to VO(–).The voltage between the remote-sense pins and the output terminals must not exceed the output voltage sense range given in the Feature Specifications table: [VO(+) – VO(–)] – [SENSE(+) ] 0.5 V Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = Vo,set x Io,max). Figure 15. Circuit Configuration for remote sense. Trim, Output Voltage Adjust (“9” Option Code) Trimming allows the output voltage set point to be increased or decreased; this is accomplished by connecting an external resistor between the TRIM pin and either the VO(+) pin or the VO(-) pin. VO(+) TRIM VO(-) Rtrim-down LOAD QBVW033A0 Rtrim-up Figure 16. Circuit Configuration to Trim Output Voltage. Connecting an external resistor (Rtrim-down) between the TRIM pin and the Vo(-) (or Sense(-)) pin decreases the output voltage set point. To maintain set point accuracy, the trim resistor tolerance should be ±1.0%. The following equation determines the required external resistor value to obtain a percentage output voltage change of Δ% 22 . 10 % 511 down trim R Where 100 % , , set o desired set o V V V For example, to trim-down the output voltage of the 12V nominal module by 20% to 9.6V, Rtrim-down is calculated as follows: 20 % 22 . 10 20 511 down trim R k R down trim 3 . 15 Connecting an external resistor (Rtrim-up) between the TRIM pin and the VO(+) (or Sense (+)) pin increases the output voltage set point. The following equations determine the required external resistor value to obtain a percentage output voltage change of Δ%: 22 . 10 % 511 % 225 . 1 %) 100 ( 11 . 5 , set o up trim V R Where 100 % , , set o set o desired V V V For example, to trim-up the output voltage of the 12V module by 5% to 12.6V, Rtrim-up is calculated is as follows: 5 % 22 . 10 5 511 5 225 . 1 ) 5 100 ( 0 . 12 11 . 5 up trim R 8 . 938 up trim R The voltage between the Vo(+) and Vo(–) terminals must not exceed the minimum output overvoltage protection value shown in the Feature Specifications table. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment trim. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = VO,set x IO,max). |
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